<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        // 可以将一个普通函数的返回值变成promise
        async function go(){
            return "p"
        }
        console.log(go());//Promise {<fulfilled>: 'p'}
        go().then(res=>{
            console.log(res);//p
        })
    </script>
</body>
</html>